It's five now - feel free to contribute :) I'm adding more little by little over the next coming days since I'm pretty busy work wise; but I'm very happy to review a PR with a new recipe!
Depending on your protein powder (casein, pea, whey isolate etc.) there is more or less binding of liquids - I recommend fine tuning it to your liking but this is a pretty thick dough on my end :D
Hm, interesting. I guess oat and coconut flour behave very differently from AP flour? My usual banana bread recipe has a higher dry to wet ingredients ratio than this and it doesn't get anywhere near dough consistency.